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How To Get Pure Sine Wave

Discussion in 'Power Electronics' started by Successdude, Nov 1, 2018.

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  1. Successdude


    Dec 28, 2017
    Hello guys! Been wondering if pure sine wave exist for inverters. I have been looking for the circuit diagram of such ... Anybody seen anyone ? How can pure sine wave (not modified sine wave) be achieved ?
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Here are two ways (there may be many others)

    The first one is to generate a sine wave and use it as the reference so your output voltage tracks it

    The second one is to have a digitised sine wave stored in a lookup table in your controller that is stepped through at the appropriate rate.

    One possible methid is to boost your input voltage to (say) 400VDC, then buck convert it to what looks like pulsed DC produced by a bridge rectifier, then use an H-bridge to invert every second pulse.

    A practical version of this would combine aspects of this together for increased efficiency and lower component count.
  3. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    How 'pure'? You will never be able to create a perfect sine, but different degrees of approximation are possible.
    You may like to read this.

    I like to add that an inverter is a dangerous circuit as it deals with high voltages and possibly high currents, too. If you lack the expertise you should not tinker with such a design unless you have someone at hand who can supervise your work before you apply power to it.
    hevans1944 likes this.
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